.content {
    position: absolute;
    width: 400px;
    height: 200px;
    margin: auto;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    background-color: #ccc;
    overflow: hidden;
}
.top-left {
    position: absolute;
    width: 100px;
    height: 100px;
    top: -50px;
    left: -50px;
    border-radius: 50%;
    background-color: #fc0;
}
.bottom-right {
    position: absolute;
    width: 100px;
    height: 100px;
    bottom: -50px;
    right: -50px;
    border-radius: 50%;
    background-color: #fc0;
}

/**{
    margin: 0;
    padding: 0;
}
html,body{
    width: 100%;
    height: 100%;
}
.content {
    position: relative;
    width: 400px;
    height: 200px;
    left: 50%;
    top: 50%;
    margin-left: -200px;
    margin-top: -100px;
    overflow: hidden;
    background-color: #ccc;
    text-align: center;
    font-size: 30px;
}
.top-left {
    position: absolute;
    width: 100px;
    height: 100px;
    top: -50px;
    left: -50px;
    border-radius: 50%;
    background-color: #fc0;
}
.bottom-right {
    position: absolute;
    width: 100px;
    height: 100px;
    bottom: -50px;
    right: -50px;
    border-radius: 50%;
    background-color: #fc0;
}*/

/**{
    margin: 0;
    padding: 0;
}
html,body{
    width: 100%;
    height: 100%;
}
.content {
    position: relative;
    width: 400px;
    height: 200px;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    overflow: hidden;
    background-color: #ccc;
    text-align: center;
    font-size: 30px;
}
.top-left {
    position: absolute;
    width: 100px;
    height: 100px;
    top: -50px;
    left: -50px;
    border-radius: 50%;
    background-color: #fc0;
}
.bottom-right {
    position: absolute;
    width: 100px;
    height: 100px;
    bottom: -50px;
    right: -50px;
    border-radius: 50%;
    background-color: #fc0;
}*/

/*
*{
    margin: 0;
    padding: 0;
}
html,body{
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}
.content {
    position: relative;
    width: 400px;
    height: 200px;
    !*left: 50%;
    top: 50%;
    margin-left: -200px;
    margin-top: -100px;*!
    overflow: hidden;
    background-color: #ccc;
    text-align: center;
    font-size: 30px;
}
.top-left {
    position: absolute;
    width: 100px;
    height: 100px;
    top: -50px;
    left: -50px;
    border-radius: 50%;
    background-color: #fc0;
}
.bottom-right {
    position: absolute;
    width: 100px;
    height: 100px;
    bottom: -50px;
    right: -50px;
    border-radius: 50%;
    background-color: #fc0;
}
*/
